Anavigation bar (ornavigation system) is a section of agraphical user interface intended to aid visitors in accessing information. Navigation bars are implemented inoperating systems,file browsers,[1]web browsers, apps, web sites and other similaruser interfaces.
File browsers use a navigation bar to assist the user in traversing thefilesystem. Navigation bars may include the currentpath,breadcrumbs, or a list offavorites.[2]
A web browser navigation bar includes the back and forward buttons, as well as theLocation bar whereURLs are entered.[3] Formerly, the functionality of the navigation bar was split between the browser'stoolbar and theaddress bar, butGoogle Chrome introduced the practice of merging the two.
Typically, websites will have a primary navigation bar[4] and sometimes secondary navigation bar on all pages. These webpage sections will include links to the most important sections of the site. Theimplementation and design of navigation bars is a crucial aspect ofweb design and webusability.
In general, navigation bars are found in a page'sheader but may also be found in the form of a sidebar.
With different purposes, there are different kinds of the navigation bars to be chosen, such as horizontal navigation bars and vertical navigation bars. And with a dynamic website project including JavaScript, navigation bars can be designed to be responsive.
Some early versions ofNetscape used theHTMLlink tag to construct a navigation bar to navigate websites.[5] Today, thenav tag can be used for the same purpose.[6] InHTML5, navigation elements are enclosed in a<nav> tag, often, containing a list of links.
<nav><ul><li><ahref="/">Home</a></li><li><ahref="/blog">Blog</a></li><li><ahref="/contact">Contact</a></li><li><ahref="/about">About</a></li></ul></nav>
The LINK element can be used to define a toolbar of navigation buttons or an equivalent mechanism such as menu items. Many of the values for the REL attribute could be reserved for this purpose (such as Home, Next, Previous, etc.)
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